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File listRoots() method in Java with examples

  • Last Updated : 28 Jan, 2019

The listRoots() method is a part of File class. The listRoots() function returns the root directories of all the available file System roots. It is guaranteed that the pathname of any file on the system will begin with any one of these roots.

Function Signature:

public static File[] listRoots()

Syntax:

File.listRoots()

Parameters: The function do not requires any parameters.

Return Value: The function returns File array, which contains all the file system roots .



Exception: This method do not throw any exceptions

Below programs will illustrate the use of listRoots() function:

Example 1: Try display all the root directories of the system




// Java program to demonstrate
// the use of File.listRoots() method
  
import java.io.*;
  
public class GFG {
  
    public static void main(String args[])
    {
        // roots of the path name
        File root[] = File.listRoots();
  
        // check if the root is null or not
        if (root != null) {
            System.out.print("Roots are: ");
  
            // display the roots of the path name
            for (int i = 0; i < root.length; i++) {
                System.out.print(root[i].getPath() + " ");
            }
        }
        else
            System.out.println("There are no roots");
    }
}

Output:

Roots are: C:\ D:\ E:\ F:\ G:\ 

The programs might not run in an online IDE. please use an offline IDE and set the path of the file

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